As we all have applied for work permit, study permit etc. at some point, usually the letter in the account is not actually the permit and it states that its not and actual permit has been mailed. This letter clearly states that this is replacement for PR card for one year. And letter does not say any other document being mailed or anything, for that reason, I am fairly confident they are not mailing physical copy as that will be absolutely redundant. This is the only thing you really need. This letter is the Confirmation of PR (COPR).